Methods + devices for monitoring + changing air pressure in a rotating wheel

ABSTRACT

Systems for monitoring and adjusting the air pressure in a rotating wheel in air-tight connection with a non-rotating axle. In one embodiment, a non-rotating tank air pressure system is separated from a wheel air pressure system by a fill-purge valve. Manipulating the fill-purge valve changes the air pressure in the wheel air pressure system, while the wheel may be rotating, and the change in air pressure is monitored by a gauge.

CROSS REFERENCE TO RELATED APPLICATION

This non-provisional application claims the benefit of, and priority to, previously-filed U.S. provisional patent application No. 61/317,574 filed Mar. 25, 2010.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to devices and methods for monitoring and changing the air pressure in a rotating wheel that is attached to a non-rotating axle. In one embodiment, the invention allows bicycle riders to monitor and adjust the air pressure in bicycle wheels while riding the bike.

2. Description of the Related Art

Under certain situations, it may be desirable to monitor and change the air pressure in wheels. As a non-limiting example, bicycle or motorcycle riders may wish to adjust the air pressure in a rotating wheel, while riding. For example, a higher air pressure creates less friction between a bicycle or motorcycle and the terrain it traverses. And, a lower wheel tube air pressure creates more friction and more rolling resistance. Increased friction may be helpful when navigating a bicycle through rocks, sand, gravel, mud, snow, and ice or in any situation where more traction is desired.

Currently existing systems require the rider to dismount from the bike, open the tire valve stem, and adjust the tire pressure by either releasing or adding air. The ability to monitor and adjust tire pressure while remaining on the bicycle, motorcycle or other vehicle can enhance the riding experience.

BRIEF SUMMARY OF THE INVENTION

The invention is not limited to bicycles, motorcycles, or other vehicles with two-wheels. Other embodiments may have any number of wheels, as long as there is at least one rotating wheel.

In one embodiment of invention, a compressed gas tank 20 is connected with a bicycle with at least two wheels. Air supply tubing 25 runs from the air tank to at least one fill-purge valve 22. The fill-purge valve is connected with air-supply tubing that runs to the wheel axle. To increase tire pressure, the rider manipulates the fill-purge valve to the “fill” position, and air flows from the higher pressure compressed air tank, through the wheel air passageway, to the wheel tire. To decrease tire pressure, the rider manipulates the fill-purge valve to the “purge” position, and air bleeds from the wheel to the atmosphere. If the rider does not manipulate the fill-purge valve, the air pressure in the wheel remains constant.

A gauge 23 is located between the fill-purge valve 22 and the wheel 11, to monitor the air pressure within the wheel air pressure system.

An air-tight connection between the fill-purge valve and the wheel tire forms the wheel air passageway. This passageway runs through air-supply tubing to the wheel axle, through the wheel axle to the hub, and from the hub to the wheel.

It is standard for a rotating wheel to be connected to a vehicle by a non-rotating axle 30. The present invention creates an air-tight connection between a rotating hub and wheel assembly and a non-rotating axle and axle assembly, while still allowing the wheel to spin easily.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS

FIG. 1 is side view of one embodiment of the invention, on a two-wheeled vehicle.

FIG. 2 is a side view of one embodiment of the air tank, connected with a partial side view of a bicycle frame.

FIG. 3 a close-up perspective view of one embodiment of the air supply tubing, gauges and fill-purge valves, connected with a partial view of the handlebars of a bicycle frame.

FIG. 4 is a close-up perspective view of one embodiment of the air supply tubing, axle, and hub, connected with a partial view of bike forks.

FIG. 5 is a close up partial side view of a wheel and one embodiment of air supply tubing connected with an open-close valve that is connected with a wheel.

FIG. 6 is a cross-sectional view of a first embodiment of a hub, with a hollow axle, axle sheath, and seals, showing the wheel air passageway.

FIG. 7 is a cross-sectional view of a second embodiment of a hub, with a dynamic seal gland, showing the wheel air passageway.

FIG. 8 is a cross-sectional view of a third embodiment of a hub, with a hollow axle, axle sheath, and seals, showing the wheel air passageway.

DETAILED DESCRIPTION OF THE INVENTION

The invention is a system for monitoring and adjusting the wheel air pressure in a rotating wheel, and includes a wheel air pressure system, inside a wheel air passageway. The wheel air pressure system and passageway are connected with and include the wheel tire, or wheel tube if a tube is used. The pressure in the wheel air pressure system is the pressure in the wheel tire.

The air tank pressure system includes a compressed air tank 20 and tubing 25 running to a fill-purge valve 22. The air tank may be any device that supplies air at higher than atmospheric pressure. For purposes of this specification, “air” and “gas” mean any compressed gas whether or not the media remains in gas form when compressed. For example, compressed carbon dioxide is in liquid form in a pressurized tank, and becomes gas as the pressure is lowered. As non-limiting examples, the air tank 20 may have compressed carbon dioxide, nitrogen or other gas. The air pressure in the air tank pressure system is higher than the air pressure in the wheel air pressure system. And, the wheel air pressure is higher than atmospheric pressure. Thus, air will flow between these air pressure systems, as required by the laws of physics.

In one embodiment, the air tank may be removeably connected with the vehicle. Or, in another embodiment, the air tank may be part of the bicycle tubing that creates the bike frame.

In one embodiment, the air tank 20 is connected with a regulator 24, to provide for a controlled decrease the air pressure from inside the air tank 20 to the air supply tubing 25.

The wheel air passageway comprises the air supply tubing, fittings, connections, o-rings, dynamic seals, and all other rotating and non-rotating parts that maintain the air-tight connection between the fill-purge valve and the wheel. It is through this wheel air passageway that air flows between the fill-purge valve and the wheel tire tube, to increase the wheel tire pressure; and from the wheel air pressure system to the atmosphere, to decrease the wheel tire pressure.

The wheel air pressure system is maintained by air-tight connections though the wheel air passageway. “Air-tight” as used in this specification, means sufficiently capable of separating the wheel air passageway from the atmosphere, while maintaining pressure in the wheel air pressure system, so that the system does not deflate during the course of a bike ride. The system may lose air over longer periods of time, resulting in a decrease in air pressure, and still be considered “air-tight” for purposes of this specification.

The air-tight connection is maintained through all parts of the wheel air passageway, including the connection between the rotating and non-rotating parts. In this specification, the rotating parts may be identified as the wheel assembly and the non-rotating parts may be identified as the axle assembly.

Various types of wheels are encompassed by the present invention. For example, bicycle wheels typically have a solid tire surrounding an inflatable tube. Car and motorcycle wheels typically have a solid tire that can be inflated. For purposes of this specification, “wheel tire” or “wheel tube” means an inflatable tire either with a tube, or without a tube as needed by the vehicle.

The Axle Assembly. All of these components of the axle assembly are non-rotating. The axle assembly includes: (1) the hollow axle 30, with an open end 31 and a closed end 32, where said open end may removeably connect with air-supply tubing 25; (2) the annular axle sheath 33, where the relative sizes of the hollow axle and the axle sheath are such that the outer circumference of the hollow axle is slightly smaller than the inner circumference of the axle sheath, and thus the hollow axle may be inserted into the axle sheath; (3) the inner race of at least two wheel bearings 36; and (4) at least two o-rings 39.

The Wheel Assembly. All of the components of the wheel assembly are rotating. The wheel assembly includes: (1) the hub 40, where the hub has an air port 41 that is capable of connecting with air-supply tubing 25 that runs to the wheel tube; (2) the outer race of at least two wheel bearing 36; (3) at least two dynamic seals 42; and (4) the wheel 11.

In the above-described embodiment, dynamic seals 42 and wheel bearings 36 are both used because they serve different functions. The wheel bearings 36 are standard technology, and contain a series of ball bearings encased inside solid, rotatable rings. Wheel bearings are typically made from steel because of the wheel bearings must bear significant weight and yet allow the encased ball bearings to easily move. It is not necessary to have wheel bearings as part of the air-tight wheel air pressure system. However, if the system will bear significant weight, it may be preferable to use wheel bearings to support weight, while allowing rotational movement.

Standard dynamic seals are not made to bear as much weight. Dynamic seals are used to create air-tight seals between rotating and non-rotating objects. In the present invention, dynamic seals 42 define part of the boundary of the wheel air pressure system.

It is preferable to have low friction between the rotating wheel 11 and non-rotating axle 30 so that the wheel spins easily. This is relevant to all wheel and axle combinations, and has particular importance to bicycle riders where muscle power supplies the energy needed to overcome friction and rolling resistance. Thus, the dynamic seal 42 allows the wheel assembly to rotate relative to the axle assembly, with a low coefficient of friction, or low rolling resistance, while maintaining the boundary between the wheel air pressure system and the external atmosphere.

It is apparent that other embodiments could be used to maintain an air-tight seal between the rotating wheel assembly and non-rotating axle assembly—as a non-limiting example—o-rings. Although it would be possible to use o-rings, there would be a strong frictional force exerted by the o-rings on the wheel assembly, increasing the rolling resistance and the coefficient of friction. However, o-rings or any other means for creating an air-tight seal between rotating and non-rotating parts may be used.

In another embodiment, the relative weight of the system compared with the weight carrying capacity of the dynamic seal may be such that no wheel bearings are needed. In this embodiment, the dynamic seals are sufficiently strong to support the weight of the system, thereby eliminating the need for a separate wheel bearing.

The rider can monitor and adjust the air pressure and air flow within the wheel air passageway, as described in this specification. The wheel air passageway includes the hollow axle in the axle assembly. The hollow axle 30 is an annular axle with a closed end 32 and an open end 31, wherein said open end connects with air-supply tubing 25. The open connection between the interior of the hollow axle 30 and the air-supply tubing 25 allows air to flow between the tubing and the hollow space defined by the interior of the hollow axle. This is part of the wheel air pressure system, and forms part of the boundary of the wheel air passageway.

In other embodiments, any device or method may be used to connect the hollow axle 30 with the air-supply tubing 25, as long as the connection is air-tight and the wheel air passageway is maintained.

The hollow axle 30 has at least one hole 38 in the annular axle body, although any number of holes may be used. For purposes of this specification, when discussing a hollow axle hole it is understood to mean at least one hole in the hollow axle.

The hollow axle hole 38 in the annular axle body 30 allows air flow between the inside of the hollow axle and the exterior of the hollow axle, as part of the wheel air passageway. The hollow axle hole is located longitudinally between two static o-rings 39 on the outside circumference of the hollow axle 30, as shown in FIGS. 6 and 8.

A standard quick release hollow axle has a lever at one end, connected with a straight axle and axle sheath. In one embodiment of the invention, the hollow quick release axle may have the open end of the hollow axle at a first end, and the quick release lever at a second end.

The open end 31 of the hollow axle 30 is capable of connecting with the air-supply tubing 25 that runs along the fork blades 12. In one embodiment, the hollow axle open end 30 may be connected with an air port 37 that is connected with air supply tubing 25, as shown in FIG. 4. The air-port 37 may be of any angle configuration, including a right-angle air port. The air-port 37 forms an air-tight connection between the hollow axle 30 and the air-supply tubing 25 on the fork 12, and defines part of the boundary of the wheel air passageway and wheel air pressure system.

A wheel axle is generally horizontal and parallel with the surface upon which the wheel is moving. In the case of bicycles, the wheel axle is maintained in this position relative to the surface by fork blades connected with a bike frame, where the fork blades are essentially vertical to the surface, and at a right-angle to the wheel axle.

It is apparent that other devices can be used to maintain the wheel axle parallel to the surface, and other devices are used in motorcycles, cars and other vehicles. As a non-limiting example, some bicycles use a single fork blade to connect the wheel to the bicycle frame. As used in this specification, fork blades shall mean at least one fork blade, or any other device that holds a wheel axle parallel relative to the surface upon which the wheel is moving.

The fork blades 12 are typically at a right angle to the wheel axle. Air-supply tubing 25, forming part of the wheel air passageway, runs along a fork blade and connects with the hollow axle. Because of the right-angle between the fork blade and axle, a right-angle air-tight fitting 37 may be used to connect the wheel air passageway from the vertical fork blades 12 to the horizontal hollow axle 30. The wheel air passageway is maintained through the right-angle fitting 37. A right-angle fitting configuration may be preferable because the air-supply tubing remains close to, or touching the fork blade, thus keeping a low profile for the air-supply system.

In other embodiments, other angles or methods may be used to connect air supply tubing to the hollow axle. Any angle or type of connection may be used, as long at air may flow between the air supply tubing and the hollow axle without leaking to atmosphere.

The axle sheath 33 is essentially a hollow annulus sized to receive the axle 30. In one embodiment, the axle sheath 33 may be a single piece as shown in FIG. 6.

In another embodiment, the axle sheath may be comprised of at least two pieces. FIG. 8 shows a two-piece axle with, comprised of a sheath body 33 a and a sheath cap 33 b. This may be a preferable embodiment for a front wheel. An axle sheath made of a plurality of pieces may be desirable for manufacture and production reasons.

It is apparent that the number of pieces of the axle sheath may be modified as desired, without affecting its function of sheathing the hollow axle.

The inner circumference of axle sheath 33 in connected with at least two o-rings 39. The two o-rings are on either side of at least one hole 29 in the annular body of the axle sheath 33, where the hole 29 is located longitudinally between the two o-rings, as shown in FIGS. 6 and 8.

As with the hollow axle, any number of holes may be used in the axle sheath. For purposes of this specification, when discussing the axle sheath hole it is understood to mean at least one hole in the axle sheath.

The hollow axle 30 is sized to fit within the axle sheath 33, and the hollow axle has at least one hole 38 longitudinally in between at least two static o-rings 39. When the hollow axle is inside the axle sheath the two o-rings 39 are thus simultaneously connected with the outer circumference of the hollow axle 30 and are correspondingly connected with the inside circumference of the axle sheath 33. The hollow axle hole and the axle sheath hole are longitudinally between the two o-rings.

When the fork blades 12 are tightened against the axle 30, pressure is exerted on these static o-rings 39, causing them to expand into the empty space between the hollow axle and the axle shaft, creating an air-tight seal, as part of the wheel air passageway.

The space created between the hollow axle and the axle sheath and the o-rings is the static interstitial space. The boundaries of this static interstitial space are the external circumference of the hollow axle body 30, the internal circumference of the axle sheath 33, and at least two static o-rings 39 between the hollow axle and the axle sheath. The static interstitial space is part of the wheel air passageway.

Thus, both the hollow axle hole 38 and the axle sheath hole 29 are longitudinally between the same two static o-rings 39. The static o-rings 39 maintain the static air-tight seal in the static interstitial space, and are part of the boundary of the wheel air passageway, allowing compressed air to flow through the axle assembly, without leaking to the outside atmosphere.

The wheel air passageway includes, in part, the axle 30, the axle sheath 33, and hub 40 with a hub port 41 through which air may flow to tubing connected with the wheel tube. Thus, air may flow in this wheel air passageway between the axle and the hub.

It is apparent that the axle does not rotate, while the hub may or may not be rotating. If the axle and hub are not rotating; the hub air-port and the axle sheath hole may not radially line up. Alternatively, if the hub is rotating, a single hub air-port will line up radially with a single axle sheath hole one time per wheel revolution. Therefore, it may be helpful to allow a greater air flow capacity from the axle to the hub. In one embodiment the hub inner circumference may have a radial trough 43, in radial alignment with at least one axle sheath hole, as shown in FIGS. 6 and 8. This configuration allows increased air flow between the axle sheath and the hub port when the hub is rotating.

Alternatively, the hub may have any other modification that allows greater air flow between the axle sheath hole 29, the dynamic interstitial space, and the hub air port 41.

The axle sheath 33 is part of both the dynamic interstitial space and the static interstitial space. Its inner circumference is a boundary of the static interstitial space, and its outer circumference is a boundary of the dynamic interstitial space.

Once the air passes through the axle sheath hole 29, it enters the dynamic interstitial space. The boundaries of the dynamic interstitial space are the external circumference of the axle sheath 33, the internal circumference of the hub 40, and at least two dynamic seals 42 connecting the hub 40 and axle sheath 33. The dynamic seals 42 are positioned so that the axle sheath hole 29 is longitudinally between two dynamic seals 42, as shown in FIGS. 6 and 8.

A dynamic seal is standard technology that allows the creation of an air-tight seal between non-rotating and rotating annular objects. The dynamic seal has an inner lip that is in air-tight connection with a first circumference, and an outer seal that is in air-tight connection with a second, wider circumference, allowing the second circumference to rotate relative to the first circumference.

In the present invention, the inner circumference, or inner lip, of the dynamic seal 42 rotates around the external circumference of the axle sheath 33, forming a rotational air-tight connection between the inner lip of the dynamic seal and the outer circumference of the axle sheath. The outer circumference of the dynamic seal 42 is in static air-tight connection with the inner circumference of the hub 40.

The inner lip of the dynamic seal 42 provides an air-tight, dynamic radial connection with the axle sheath 33. Likewise, the dynamic seal outer circumference remains in air-tight connection with the hub 40. When the hub 40 rotates, the dynamic seals 42 will also rotate around the non-rotating axle, because they remain in a fixed position relative to the hub. Thus, the dynamic seals 42 allow the creation of an air-tight space where air can pass from a non-rotating axle assembly into the rotating wheel assembly, with relatively low friction. This is the dynamic interstitial space.

The dynamic seals 42 are part of the wheel air passageway, and define part of the boundary of the wheel air passageway between the non-rotating axle assembly and the rotating wheel assembly.

Other means could be used to create an air-tight connection, as a non-limiting example, o-rings. But, it is preferable to have low friction between the rotating and non-rotating parts so that wheels spin easily. Thus, the dynamic seal 42 allows the wheel assembly to rotate relative to the axle assembly, with a low coefficient of friction, or low rolling resistance, while maintaining an air-tight connection, and forming part of the boundary between the wheel air passageway and the atmosphere.

The inner circumference of the hub 40 forms part of the boundary of the dynamic interstitial space. In one embodiment, the hub 40 has an air-port 41 that is in air-tight connection with the radial trough 43. This hub air-port is located in alignment with the axle shaft hole 29 (and trough 43, if any) so that air flows between the axle shaft hole 29, and the hub air port 41, as part of the wheel air passageway, as shown in FIGS. 6 and 8. The hub port 41 is located so that it is in radial alignment with the axle sheath hole 29 to create the wheel air passageway.

As the hub 40 turns, the hub air port 41 may remain in longitudinal alignment with the trough 43, or if there is no trough the hub air port 41 may come into radial alignment with the axle sheath hole 29 as the hub 40 rotates.

The hub air port 41 is in air-tight connection with the wheel tire tube. One embodiment of this air-tight connection is air-supply tubing 25, as shown in FIG. 5.

The dynamic interstitial space and the hub air port 41, and the air-supply tubing 25 are part of the wheel air passageway, and form part of its boundary.

FIG. 7 is a cross-sectional view of another embodiment of an air passageway system, without relying on a hollow axle as a component of an air-tight connection between the non-rotating and rotating components of the system. In this embodiment, the wheel air passageway runs between the air-supply tubing 25, a radial seal gland 44, hub channel 45 and hub port 41. As in the other embodiments, hub port 41 connects with air-supply tubing 25 that runs to the wheel 11 and the wheel tube.

As shown in FIG. 7, at least two dynamic seals 42 are in air-tight radial connection with the external surface of the hub 40 and are axially and radially constrained within a dynamic radial seal gland 44. The dynamic seals 42 maintain the air-tight radial connection between the seal gland 44 and the rotating hub body 40 within.

The radial seal gland 44 may be guided by traditional ball bearings or plain bearing technology. The radial seal gland and air supply tubing 25 do not rotate, while the hub may rotate. The air supply tubing 25 may be held in place with additional assistance from a mechanical arm. Air is conveyed through the wheel air passageway from the fill-purge valve 22, though the air-supply tubing 25, and the seal gland 44. The dynamic interstitial space resides between the seal gland 44, the two or more dynamic seals 42, and the rotating hub 40. Air is then conveyed via one or more passages 45 within the hub body 40 itself, to the hub fitting 41 and on to the via air hose 25.

The wheel air passageway continues from the hub 40 to the wheel 11. Air supply tubing 25 runs between the hub port 41 and the wheel 11 tube, and thus the tubing 25 has one end in air-tight connection with the hub air port 41 and a second end in air-tight connection with the wheel tube. The wheel tube air connection, in one embodiment, may have a valve 35 that separates the wheel tube from the rest of the wheel air passageway, as shown in FIG. 5. When the valve 35 is open, the wheel air passageway runs from the fill-purge valve 22 to the wheel tube. When this valve 35 is closed, the wheel tube is separated from the rest of the wheel air passageway. When the open-close valve is manipulated to the closed position, the wheel air pressure system inside the wheel tire is separated from, and closed off, from atmospheric pressure. Thus, when removing the wheel, it may be helpful to close the open-close valve and thus maintain the wheel air pressure even though the wheel is no longer connected with the rest of the wheel pressure system.

When the rider disconnects the wheel axle 30 from the fork blades 12, the rider may disconnect the angled-fitting 37 from the hollow axle air-port 37. It is apparent that the air pressure within the wheel tube, and entire wheel passageway system is higher than atmospheric pressure. Thus, when the angled-fitting 37 is disconnected from the hollow axle 30, air will flow from within the wheel air passageway to the lower atmospheric pressure. To prevent the wheel tube from completely deflating to atmospheric pressure, it may be helpful to close off the wheel tube from the outside atmosphere, and thereby maintain air pressure within the wheel tube. In one embodiment, an open-close valve 35 is used to either separate or connect the wheel tube to the atmospheric pressure.

It is apparent that the open-close valve 35 may be located anywhere between the hollow axle 30 and the wheel tube. For convenience, in one embodiment, the open-close valve 35 is located at the wheel tube side of the air-supply tubing, as shown in FIG. 5. In this embodiment, the air-supply tubing 25 connects the hub 40 to the wheel tube, and the open-close valve 35 is positioned at the wheel tube end of the air-supply tubing 25. To remove the wheel 11 from the fork blades 12, the rider may manipulate the valve 35 to the closed position, disconnect the angled fitting 37 from the hollow axle 30, release the axle 30 from the fork blades 12, and remove the wheel 11. Because the open-close valve 35 is “closed”, the wheel tube will maintain the air pressure of the wheel system, even when the wheel 11 is removed from the forks 12.

Bicycles frequently have wheels with an axle that is capable of removeably connecting to fork blades. A bike fork 12 typically has two blades that descend from the fork crown. In a non-limiting typical configuration, each fork blade has a slot or hole. The axle is connected with at least one adapter 15 that connects with the fork blade, so that the wheel is between the two fork blades. Typically, each axle has two ends, and each end is typically fitted with an adapter 15, as shown in FIGS. 6, 7, and 8. The fork blades 12 are tightened toward each other, compressing against the adapter 15, and thereby holding the bike wheel to the fork blades and the bike. The adapter removeably connects the axle with the bicycle fork through standard technology, for example, a quick release system, or a standard nut and bolt system.

Standard quick release technology allows bike riders to quickly and easily remove bike wheels from the bike frame, by simply manipulating a lever on one end of the quick release axle. When a rider manipulates the lever in one direction the inward pressure on the fork blades increases, and when the bike rider manipulates the lever in the other direction, the inward pressure on the fork blades decreases. Increasing the inward pressure on the fork blades compresses the blades against the axle/adapter, and thus holds the wheel to the bike frame.

In one embodiment, when using a quick release hollow axle, the wheel fits between the two fork blades, so that a first adapter on the open end of the axle sheath is connected with a first fork blade, and a second adapter on the closed end of the axle sheath is connected with a second fork blade.

In another embodiment, the fork blades are compressed onto the adapters by having a threaded end on the axle/adapter, which serves as a bolt. A nut is tightened against the outside of the fork blade, moving the fork blade toward the center, compressing against the axle/adapter, and holding the wheel to the bike.

In the present invention, the action of increasing the inward pressure on the fork blades to hold the wheel to the bike frame 10 also puts pressure on the static o-rings 39. As the fork blades 12 are tightened inward, they exert pressure on the axle/adapter, compressing the adapter 15 against the static o-rings 39, and forcing the o-rings inward against the hollow axle 30, creating an air-tight seal.

Other embodiments may have a different number of forks, or a different configuration for connecting with the axle. In these embodiments, the inward pressure used to removeably connect the wheel will compress the o-rings, and form an air-tight seal.

When a rider wants to increase the air pressure in a rotating tire, the rider will manipulate the fill-purge valve 22. Fill-purge valve 22 is a valve that allows compressed air to (1) to flow from the compressed air tank 20 into the wheel air pressure system, thereby increasing the wheel tube air pressure, or (2) to flow from the wheel air pressure system to the atmosphere, thereby decreasing the wheel tube air pressure, or (3) to separate the pressure in the wheel tube air pressure system from the tank air pressure system and atmospheric pressure, thereby maintaining a constant wheel tube pressure.

In one embodiment, there is one fill-purge valve 22 for each wheel 11. In this embodiment, manipulating one fill-purge valve 22 will thus change the air pressure in a single wheel. In another embodiment, there may be only one fill-purge valve 22 for all wheels. In this embodiment, manipulating the fill-purge valve 22 will adjust the air pressure in all wheels connected with the valve.

In one embodiment, the fill-purge valve 22 is a three-position, three-port valve. When a rider manipulates the fill-purge valve to the “fill” position compressed air flows from the compressed air tank 20 through air-supply tubing 25 to, in, and through the fill-purge valve 22, to air-supply tubing 25 that is ultimately connected with the wheel tube.

The compressed air is delivered from a compressed air tank 20 that is capable of supplying compressed air at pressures higher than the pressure desired inside the wheel tube. The compressed air tank 20 may be any tank that can deliver compressed air at pressures that are higher than needed to inflate the wheel tube. The air tank may be removeably mounted anywhere on the bike or the rider's body that is convenient. In one embodiment, the air tank is removeably mounted to the bike frame at standard water bottle locations.

Bicycle tubes can range in air pressure, with maximum air pressures of over 140 pounds per square inch. Due to the laws of physics, compressed air will flow from spaces that have higher air pressure to spaces with lower air pressure. Thus, to inflate the wheel tube, compressed air must be delivered to the wheel tube at pressures that are higher than the desired tube inflation value.

The fill-purge valve 22 divides the air tank pressure system from the wheel tube pressure system. The air flows from higher pressure on the air tank air pressure system side, through air-supply tubing 25 to the fill-purge valve 22, and when the fill-purge valve is set to “fill” air flows from this higher tank air pressure system, through the fill-purge valve to the lower wheel tube air pressure system. The air pressure in the wheel tube air pressure system is essentially the same throughout the system, from the fill-purge valve 22 to the wheel tube itself, as there is an open connection through the wheel air passageway, allowing free air flow between these two points. Thus, the air may flow either from the fill-purge valve 22 toward the wheel 11 tube, or from the wheel 11 tube toward the fill-purge valve 22, as required by the laws of physics to adjust the air pressure within the wheel tube system.

When the rider manipulates the fill-purge valve 22 to the “fill” position, air flows from the higher pressure air tank system into the lower pressure wheel tube system. In one embodiment, the first bolus of air will proceed through from the fill-purge valve 22, through air-supply tubing 25 to the angled air port 37, into the hollow axle 30, through the axle hole 38 into the static interstitial space through the axle sheath hole 29 into the dynamic interstitial space out the hub 40 and into tubing 25 connected to the wheel tube stem and wheel tube itself. Obviously, this air flow happens rapidly. The air pressure inside the wheel tube and corresponding wheel tube air pressure system will continue to increase as long as the fill-purge valve 22 is in the “fill” position.

Likewise, when the rider wants to decrease the air pressure in the wheel tube and the wheel air passageway, the rider manipulates the fill-purge valve 22 to the “purge” position. The air pressure within the wheel tube and wheel air passageway is higher than atmospheric pressure, and manipulating the fill-purge valve 22 to “purge” allows air to flow from the wheel tube and wheel air passageway to the outside atmosphere. This has the effect of decreasing the air pressure in the wheel tube.

If the rider does not manipulate the fill-purge valve 22, the fill-purge valve remains closed or off, and will block all air pressure systems from each other. The wheel tube air pressure system, the air tank air pressure system, and the atmospheric pressure will all remain separate from each other when the fill-purge valve is off, thus maintaining the bike tube air pressure at a constant level.

While riding the bike, and with the wheels in rotational motion, the rider may wish to change the air pressure in the bike tube. To accomplish this, the rider manipulates the fill-purge valve 22 to change the wheel tube air pressure. After or while manipulating the fill-purge valve 22, the rider may want to know the new level of air pressure within the wheel tube and wheel air passageway. One embodiment uses an air-pressure gauge 23 to monitor the air pressure within the bike tube system.

The air pressure within the wheel tube system is essentially constant, and thus a gauge measuring the air pressure may be located at any point within the bike tube system. For convenience, in one embodiment the gauge 23 is located in tubing near the bike handlebars. In this embodiment, the fill-purge valve and air pressure gauge are both located near the handlebars 14, so that the rider can easily manipulate the fill-purge valve while the hands remain on or near the handlebars. An air-pressure gauge positioned close to the handlebars is convenient because the rider can look down and read the gauge to monitor the air pressure within the bike tube system.

Thus, while manipulating the fill-purge valve 22, the rider may simultaneously and continuously read the air-pressure gauge 23 to monitor the changing air pressure within the wheel tube air passageway system. When the air-pressure gauge 23 reads at the desired air pressure, the rider manipulates the fill-purge valve to the “off” position, and the bike tube system and air tank system are closed, and the air pressure within bike tube system remains constant. The air pressure within the bike tube system will be maintained at the new level when the fill-purge valve is in the off position.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed in this specification are to be considered in all respects as illustrative and not restrictive, and all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein. 

1. A system for adjusting air pressure in a rotating wheel comprising: a compressed gas tank having an air pressure higher than atmospheric pressure; a hollow axle with an open end and a closed end, wherein said hollow axle has at least one hollow axle hole; an air supply tubing connecting said compressed gas tank with said hollow axle open end; a fill-purge valve in air-tight connection with said air supply tubing wherein said fill-purge valve separates a compressed gas tank air pressure system from a wheel air pressure system, and from atmospheric pressure; at least two o-rings in air-tight connection with an outer circumference of said hollow axle, and wherein said at least one hollow axle hole is located longitudinally between said at least two o-rings; an annular axle sheath with an outer circumference and an inner circumference, wherein said annular axle sheath inner circumference is sized to receive said at least one hollow axle and at least two o-rings, and wherein said annular axle sheath has at least one axle sheath hole located longitudinally between said at least two o-rings, and wherein said at least two o-rings form an air-tight connection between said hollow axle and said annular axle sheath; at least two dynamic seals wherein said at least one axle sheath hole is located longitudinally between said at least two dynamic seals, wherein an inner lip of each at least two dynamic seals is in dynamic air-tight connection with said annular axle sheath outer circumference; wherein an outer circumference of each dynamic seal is in static air-tight connection with a rotating hub having an inner circumference, and wherein said at least two dynamic seals maintain an air-tight connection with said rotating hub inner circumference and said annular axle sheath, while said rotating hub inner circumference rotates relative to said annular axle sheath; a radial trough in said rotating hub inner circumference, wherein said radial trough is in radial alignment with said at least one axle sheath hole; a hub air-port in air-tight connection with said radial trough, where said hub air-port connects with air-supply tubing that connects with a wheel tire.
 2. The system of claim 1, wherein an angled air-port removeably connects said hollow axle open end with said air supply tubing.
 3. The system of claim 2, wherein said angled air-port is a right-angle connection.
 4. The system of claim 1, wherein said annular axle sheath comprises an axle body and an axle cap.
 5. The system of claim 1, wherein an air-pressure gauge is connected with said air supply tubing, between said fill-purge valve and said hollow axle.
 6. The system of claim 1, wherein at least two wheel bearings are in rotational connection between said annular axle sheath and said rotating hub inner circumference.
 7. The system of claim 1, wherein said rotating wheel is removeably connected with at least one fork blade.
 8. The system of claim 7, wherein said rotating wheel is connected to said fork blade by compressing said fork blade against at least one adapter, wherein said at least one adapter compresses said o-rings, forming an air-tight connection between said hollow axle and said annular axle sheath.
 9. The system of claim 1, wherein said fill-purge valve is in air-tight connection with said air supply tubing between said rotating hub and said rotating wheel, wherein said fill-purge valve separates said wheel air pressure system from atmospheric pressure.
 10. The system of claim 1, wherein said hollow axle is a quick release axle, with a quick release lever at said closed end.
 11. A system for adjusting air pressure in a rotating wheel comprising: a compressed gas tank containing compressed gas, where said compressed gas pressure is higher than atmospheric pressure; an air supply tubing connecting said compressed gas tank with a non-rotating dynamic seal gland; a fill-purge valve in air-tight connection with said air supply tubing wherein said fill-purge valve separates a compressed gas tank air pressure system from a wheel air pressure system, and from atmospheric pressure; a rotating hub in connection with said non-rotating dynamic seal gland, and at least two dynamic seals, wherein said at least two dynamic seals form an air-tight connection with said rotating hub, and wherein said rotating hub rotates relative to said non-rotating dynamic seal gland and at least two dynamic seals; a radial trough in said rotating hub, with a first end in air-tight connection with said at least two dynamic seals, and a second end in air-tight connection with a hub air-port, wherein said hub air-port connects said air-supply tubing with said a wheel tire.
 12. The system of claim 11 wherein a fill-purge valve is in air-tight connection with said air-supply tubing between said hub air-port and said rotating wheel.
 13. A method of monitoring and adjusting air pressure in a rotating wheel, comprising: monitoring an air pressure gauge that measures air pressure in a wheel air pressure system; manipulating a fill-purge valve to transfer compressed gas from a compressed gas tank through a non-rotating axle assembly to said wheel air pressure system or from said wheel pressure system through a non-rotating axle assembly towards atmospheric pressure; monitoring said air-pressure gauge, and ceasing manipulation of said fill-purge valve when said wheel air pressure is at a desired pressure.
 14. The method of claim 13 wherein said non-rotating axle assembly comprises: a hollow axle with an open end and a closed end wherein said hollow axle has at least one hollow axle hole; a air supply tubing connecting said fill-purge valve with said hollow axle open end; at least two o-rings in air-tight connection with an outer circumference of said hollow axle, and wherein said at least one hollow axle hole is located longitudinally between said two o-rings; an annular axle sheath with an outer circumference and an inner circumference, where said annular axle sheath inner circumference is sized to receive said hollow axle and said two o-rings, and wherein said annular axle sheath has at least one axle sheath hole located longitudinally between said two o-rings, and wherein said two o-rings form an air-tight connection between said hollow axle and said axle sheath; and an hub assembly comprising: a hub that rotates around said axle assembly, wherein said hub has a radial trough on an inner circumference of said hub, where said radial trough is in radial alignment with at least one axle sheath hole; at least two dynamic seals wherein said at least one axle sheath hole is located longitudinally between said at least two dynamic seals, wherein an inner lip of each dynamic seal is in dynamic air-tight connection with said annular axle sheath outer circumference, wherein an outer circumference of each dynamic seal is in static air-tight connection with a hub inner circumference, and wherein said at least two dynamic seals maintain an air-tight connection between said hub and said annular axle sheath while said hub rotates relative to said annular axle sheath; a hub air-port, wherein said hub air-port is in air-tight connection with said radial trough, where said hub air-port connects with air-supply tubing that connects with a wheel tire. 